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Equivalences magnitudes absolues H - diamètres moyens d (en km) |
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formule du calcul approximatif des diamètres moyens : log d = C — H/5 |
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avec C =
constante variable selon le type physique et H = magnitude absolue |
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Document mis au point
par Michel-Alain Combes |
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Magnitude |
Type |
Types |
Type |
Type |
Type |
Type |
Types |
diamètres |
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absolue |
E |
V et R |
S |
M |
C |
C |
C et T |
standards |
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visuelle |
3.30 |
3.40 |
3.50 |
3.55 |
3.70 |
3.80 |
3.90 |
constante |
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H |
~0.34 |
~0.26 |
~0.15 |
~0.11 |
~0.06 |
~0.04 |
~0.02 |
albédo |
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13.0 |
5.0 |
6.3 |
7.9 |
8.9 |
12.6 |
15.8 |
20.0 |
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13.2 |
4.6 |
5.8 |
7.2 |
8.1 |
11.5 |
14.5 |
18.2 |
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13.4 |
4.2 |
5.2 |
6.6 |
7.4 |
10.5 |
13.2 |
16.6 |
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13.6 |
3.8 |
4.8 |
6.0 |
6.8 |
9.5 |
12.0 |
15.1 |
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13.8 |
3.5 |
4.4 |
5.5 |
6.2 |
8.7 |
11.0 |
13.8 |
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14.0 |
3.2 |
4.0 |
5.0 |
5.6 |
7.9 |
10.0 |
12.6 |
type
S = 5.0 km |
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14.2 |
2.9 |
3.6 |
4.6 |
5.1 |
7.2 |
9.1 |
11.5 |
type
C = 10.0 km |
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14.4 |
2.6 |
3.3 |
4.2 |
4.7 |
6.6 |
8.3 |
10.5 |
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14.6 |
2.4 |
3.0 |
3.8 |
4.3 |
6.0 |
7.6 |
9.5 |
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14.8 |
2.2 |
2.8 |
3.5 |
3.9 |
5.5 |
6.9 |
8.7 |
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15.0 |
2.0 |
2.5 |
3.2 |
3.5 |
5.0 |
6.3 |
7.9 |
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15.2 |
1.8 |
2.3 |
2.9 |
3.2 |
4.6 |
5.8 |
7.2 |
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15.4 |
1.7 |
2.1 |
2.6 |
3.0 |
4.2 |
5.2 |
6.6 |
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15.6 |
1.5 |
1.9 |
2.4 |
2.7 |
3.8 |
4.8 |
6.0 |
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15.8 |
1.4 |
1.7 |
2.2 |
2.5 |
3.5 |
4.4 |
5.5 |
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16.0 |
1.3 |
1.6 |
2.0 |
2.2 |
3.2 |
4.0 |
5.0 |
type
S = 2.0 km |
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16.2 |
1.2 |
1.4 |
1.8 |
2.0 |
2.9 |
3.6 |
4.6 |
type
C = 4.0 km |
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16.4 |
1.1 |
1.3 |
1.7 |
1.9 |
2.6 |
3.3 |
4.2 |
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16.6 |
1.0 |
1.2 |
1.5 |
1.7 |
2.4 |
3.0 |
3.8 |
type
S = 1.5 km |
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16.8 |
0.9 |
1.1 |
1.4 |
1.5 |
2.2 |
2.8 |
3.5 |
type
C = 3.0 km |
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17.0 |
0.8 |
1.0 |
1.3 |
1.4 |
2.0 |
2.5 |
3.2 |
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17.2 |
0.7 |
0.9 |
1.1 |
1.3 |
1.8 |
2.3 |
2.9 |
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17.4 |
0.7 |
0.8 |
1.0 |
1.2 |
1.7 |
2.1 |
2.6 |
type
S = 1.0 km |
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17.6 |
0.6 |
0.8 |
1.0 |
1.1 |
1.5 |
1.9 |
2.4 |
type
C = 2.0 km |
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17.8 |
0.6 |
0.7 |
0.9 |
1.0 |
1.4 |
1.7 |
2.2 |
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18.0 |
0.5 |
0.6 |
0.8 |
0.9 |
1.3 |
1.6 |
2.0 |
type
S = 800 m |
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18.2 |
0.5 |
0.6 |
0.7 |
0.8 |
1.1 |
1.4 |
1.8 |
type
C = 1.6 km |
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18.4 |
0.4 |
0.5 |
0.7 |
0.7 |
1.0 |
1.3 |
1.7 |
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18.6 |
0.4 |
0.5 |
0.6 |
0.7 |
1.0 |
1.2 |
1.5 |
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18.8 |
0.4 |
0.4 |
0.5 |
0.6 |
0.9 |
1.1 |
1.4 |
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19.0 |
0.3 |
0.4 |
0.5 |
0.6 |
0.8 |
1.0 |
1.3 |
type
S = 500 m |
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19.2 |
0.3 |
0.4 |
0.5 |
0.5 |
0.7 |
0.9 |
1.1 |
type
C = 1.0 km |
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19.4 |
0.3 |
0.3 |
0.4 |
0.5 |
0.7 |
0.8 |
1.0 |
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19.6 |
0.2 |
0.3 |
0.4 |
0.4 |
0.6 |
0.8 |
0.9 |
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19.8 |
0.2 |
0.3 |
0.3 |
0.4 |
0.5 |
0.7 |
0.9 |
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20.0 |
0.2 |
0.3 |
0.3 |
0.4 |
0.5 |
0.6 |
0.8 |
type
S = 300 m |
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20.2 |
0.18 |
0.2 |
0.3 |
0.3 |
0.5 |
0.6 |
0.7 |
type
C = 600 m |
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20.4 |
0.17 |
0.2 |
0.3 |
0.3 |
0.4 |
0.5 |
0.7 |
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20.6 |
0.15 |
0.19 |
0.2 |
0.3 |
0.4 |
0.5 |
0.6 |
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20.8 |
0.14 |
0.17 |
0.2 |
0.2 |
0.3 |
0.4 |
0.5 |
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21.0 |
0.13 |
0.16 |
0.2 |
0.2 |
0.3 |
0.4 |
0.5 |
type
S = 200 m |
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21.2 |
0.12 |
0.14 |
0.18 |
0.2 |
0.3 |
0.4 |
0.5 |
type
C = 400 m |
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21.4 |
0.11 |
0.13 |
0.17 |
0.19 |
0.3 |
0.3 |
0.4 |
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21.6 |
0.10 |
0.12 |
0.15 |
0.17 |
0.2 |
0.3 |
0.4 |
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21.8 |
0.09 |
0.11 |
0.14 |
0.15 |
0.2 |
0.3 |
0.4 |
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22.0 |
0.08 |
0.10 |
0.13 |
0.14 |
0.2 |
0.3 |
0.3 |
Limite des PHA |
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22.2 |
0.07 |
0.09 |
0.11 |
0.13 |
0.18 |
0.2 |
0.3 |
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22.4 |
0.07 |
0.08 |
0.10 |
0.12 |
0.17 |
0.2 |
0.3 |
type
S = 100 m |
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22.6 |
0.06 |
0.08 |
0.10 |
0.11 |
0.15 |
0.19 |
0.2 |
type
C = 200 m |
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22.8 |
0.06 |
0.07 |
0.09 |
0.10 |
0.14 |
0.17 |
0.2 |
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23.0 |
0.05 |
0.06 |
0.08 |
0.09 |
0.13 |
0.16 |
0.2 |
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23.2 |
0.05 |
0.06 |
0.07 |
0.08 |
0.11 |
0.14 |
0.18 |
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23.4 |
0.04 |
0.05 |
0.07 |
0.07 |
0.10 |
0.13 |
0.17 |
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23.6 |
0.04 |
0.05 |
0.06 |
0.07 |
0.10 |
0.12 |
0.15 |
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23.8 |
0.04 |
0.04 |
0.05 |
0.06 |
0.09 |
0.11 |
0.14 |
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24.0 |
0.03 |
0.04 |
0.05 |
0.06 |
0.08 |
0.10 |
0.13 |
type
S = 50 m |
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24.2 |
0.03 |
0.04 |
0.05 |
0.05 |
0.07 |
0.09 |
0.11 |
type
C = 100 m |
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24.4 |
0.03 |
0.03 |
0.04 |
0.05 |
0.07 |
0.08 |
0.10 |
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24.6 |
0.02 |
0.03 |
0.04 |
0.04 |
0.06 |
0.08 |
0.09 |
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24.8 |
0.02 |
0.03 |
0.03 |
0.04 |
0.05 |
0.07 |
0.09 |
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25.0 |
0.02 |
0.03 |
0.03 |
0.04 |
0.05 |
0.06 |
0.08 |
type
S = 30 m |
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25.2 |
0.018 |
0.02 |
0.03 |
0.03 |
0.05 |
0.06 |
0.07 |
type
C = 60 m |
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25.4 |
0.017 |
0.02 |
0.03 |
0.03 |
0.04 |
0.05 |
0.07 |
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25.6 |
0.015 |
0.019 |
0.02 |
0.03 |
0.04 |
0.05 |
0.06 |
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25.8 |
0.014 |
0.017 |
0.02 |
0.02 |
0.03 |
0.04 |
0.05 |
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26.0 |
0.013 |
0.016 |
0.02 |
0.02 |
0.03 |
0.04 |
0.05 |
type
S = 20 m |
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26.2 |
0.012 |
0.014 |
0.018 |
0.02 |
0.03 |
0.04 |
0.05 |
type
C = 40 m |
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26.4 |
0.011 |
0.013 |
0.017 |
0.019 |
0.03 |
0.03 |
0.04 |
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26.6 |
0.010 |
0.012 |
0.015 |
0.017 |
0.02 |
0.03 |
0.04 |
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26.8 |
0.009 |
0.011 |
0.014 |
0.015 |
0.02 |
0.03 |
0.04 |
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27.0 |
0.008 |
0.010 |
0.013 |
0.014 |
0.02 |
0.03 |
0.03 |
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27.2 |
0.007 |
0.009 |
0.011 |
0.013 |
0.018 |
0.02 |
0.03 |
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27.4 |
0.007 |
0.008 |
0.010 |
0.012 |
0.017 |
0.02 |
0.03 |
type
S = 10 m |
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27.6 |
0.006 |
0.008 |
0.010 |
0.011 |
0.015 |
0.019 |
0.02 |
type
C = 20 m |
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27.8 |
0.006 |
0.007 |
0.009 |
0.010 |
0.014 |
0.017 |
0.02 |
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28.0 |
0.005 |
0.006 |
0.008 |
0.009 |
0.013 |
0.016 |
0.02 |
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28.2 |
0.005 |
0.006 |
0.007 |
0.008 |
0.011 |
0.014 |
0.018 |
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28.4 |
0.004 |
0.005 |
0.007 |
0.007 |
0.010 |
0.013 |
0.017 |
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28.6 |
0.004 |
0.005 |
0.006 |
0.007 |
0.010 |
0.012 |
0.015 |
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28.8 |
0.004 |
0.004 |
0.005 |
0.006 |
0.009 |
0.011 |
0.014 |
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Type |
Types |
Type |
Type |
Type |
Type |
Types |
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E |
V
et R |
S |
M |
C |
C |
C
et T |
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Les plus petits NEA connus ont H = 30.0 et un diamètre moyen de l'ordre de 5
mètres |
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Les zones en jaune et bleu clair du haut concernent les
diamètres moyens supérieurs à 200 mètres |
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Les zones en vert clair concernent les diamètres moyens compris
entre 200 et 20 mètres |
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Les zones en jaune du bas concernent les diamètres moyens
inférieurs à 20 mètres |
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On considère
que les objets de type C ont un diamètre double de ceux de type S |
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Les NEA avec
MOID < 0.050 UA et H < 22.1 sont des PHA (Potentially Hazardous
Asteroids) |
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La valeur
moyenne (type S) est de 130 mètres, les extrêmes vont de 80 à 300 mètres |
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Tous les diamètres de ce tableau ne sont que des
ordres de grandeur bien entendu |
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